A word from Carolann, the 'Undertale Undyne' costume creator:

I'm wearing the costume I made from scratch, it took about 300 hours total including a silicone bodice pulled from a custom mold, ears and teeth sculpted on life casts of body parts, armor made from foam & thermal plastic, a custom built hoop skirt, airbrushed on custom mixed PAX body paint, and 60 ft of custom trims.